I was doing functional connectivity (correlate the time course of one ROI with the whole brain), and got a estimation error: "Output argument "V" (and maybe others) not assigned during call to spm_reml.m (spm_reml)"." The error happened when trying to calculate the 128th ReML iteration.
While search the list, the error also happened in other situations besides functional connectivity. It was said ReML didn't converge, but no solution is provided.
I noticed other regressors (motion parameters) worked, and the values of motion parameters were around 0. The values of the input ROI time course from marsbar were around 100. I removed the mean value from the time course to make it around 0, and the error was gone.
This could provide a clue for the errors in other situations
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Xiang
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